Abstract
Imaging spectroscopy of a single GaAs interface fluctuation quantum dot (IFQD) was performed using a near-field scanning optical microscope (NSOM) with a spatial resolution of 40 nm. A difference in the emission profiles of an exciton and a biexciton was found for several IFQDs. By comparing with a numerical simulation based on the finite-difference time-domain method, this difference was attributed to the existence of a shallow potential dip in the IFQD. The NSOM wavefunction mapping for excitons and biexcitons as quasiparticles with different masses is a tool for investigating weak confinement potentials to detect local strain and disorder.
Original language | English |
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Article number | 083116 |
Journal | Applied Physics Letters |
Volume | 93 |
Issue number | 8 |
DOIs | |
Publication status | Published - 2008 |
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)